Be → Sr : form only monoxide(MO) Ba : form peroxide BaO2 under pressure; Solubility increases from BeO to BaO BeO,MgO,SrO,BaO → increasing solubility; All oxides are base (BeO is amphoteric) Solubility Patterns in the Periodic Table continued 2 216 linn Scientiic nc ll ihts esered 4. Properties of the Alkaline Earth Metals . Because BeO and MgO are much more inert than the other group 2 oxides, they are used as refractory materials in applications involving high temperatures and mechanical stress. When the metal ammonia solutions are evaporated, hexammoniates [M (NH 3) 6] 2+ are formed. Solubility in liquid ammonia. All the alkaline earth metals have two electrons in their valence shell, so they lose two electrons to form cations with a 2+ charge. The alkaline earths possess many of the characteristic properties of metals.Alkaline earths have low electron affinities and low electronegativities.As with the alkali metals, the properties depend on the ease with which electrons are lost.The alkaline earths have two electrons in the outer shell. 2. PHYSIAL PROPERTIES. Like alkali metals, alkaline earth metals dissolve in liquid ammonia giving coloured solutions. Based on your data, select the compound within each pair that is less soluble in water: a. magnesium oxalate or strontium oxalate b. barium chromate or magnesium chromate c. calcium sulfate or barium sulfate 4. _____ _____ _____ _____ 3. Reactions of Alkaline Earth Metals. Properties . The ammoniates are good conductors of electricity and decompose at high temperature. 2) sodium or ammonium carbonate is added to the solution of alkaline earth metal salt such as CaCl 2. Hydroxides of the lighter alkaline earth metals are insoluble in water, but their solubility increases as the atomic number of the metal increases. All metal oxides are ionic (except BeO) divalent metal ions are sufficiently polarizing to make peroxide when heated in pure oxygen. Add 1 mL (about 25 drops or fill the well about 1⁄ 4 inch or 0.5 cm deep) of an alkaline earth metal chloride solution to each well in a horizontal row, as follows (see Figure 1): What trend in solubility did you observe for the alkaline earth metals? The alkaline earth metals are the elements that correspond to group 2 of the modern periodic table. The alkaline earth metals comprise the group 2 elements. Oxides and Hydroxides The precipitations of alkaline‐earth metal and transition metal oxalates, from aqueous solution and from excess alkali metal oxalate solution, are surveyed: also the coprecipitations of transition metal oxalates together with alkaline‐earth metal oxalates. An alkaline earth metal gives a salt with chlorine which is sparingly soluble in water at room tempreture but fairly soluble in boiling water. All the discovered alkaline earth metals occur in nature. Because BeO and MgO are much more inert than the other group 2 oxides, they are used as refractory materials in applications involving high temperatures and mechanical stress. 1) All carbonates are ionic but beryllium carbonate is prone to hydrolysis. the alkaline earth metal is Hydroxides of the lighter alkaline earth metals are insoluble in water, but their solubility increases as the atomic number of the metal increases. This group of elements includes beryllium, magnesium, calcium, strontium, barium, and radium.The elements of this group are quite similar in their physical and chemical properties. 9. 10. CaCl 2 + Na 2 CO 3 ——> CaCO 3 + 2 NaCl. 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